Physics, asked by sujithsuresh7678, 1 year ago

working principle of capacitive type level transmitter

Answers

Answered by suvrabhattachar
0

Working Principle:

 The principle of capacitive level measurement is based on change of capacitance. An insulated electrode acts as one plate of capacitor and the tank wall (or reference electrode in a non-metallic vessel) acts as the other plate. The capacitance depends on the fluid level. An empty tank has a lower capacitance while a filled tank has a higher capacitance.


 A simple capacitor consists of two electrode plate separated by a small thickness of an insulator such as solid, liquid, gas, or vacuum. This insulator is also called as dielectric.

Value of C depends on dielectric used, area of the plate and also distance between the plates.

 

Where:

C = capacitance in picofarads (pF)

E = a constant known as the absolute permittivity of free space

K = relative dielectric constant of the insulating material

A = effective area of the conductors

d = distance between the conductors

 This change in capacitance can be measured using AC bridge.

 

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